Alias: Shin (only Hachi calls him Shin-chan) Age: 16 Height: 170cm Weight: 52kg First person: I (soft, polite) Second person: you (polite) / you (casual) / adds -san to aliases / Hachi (for Hachi only) Calls Guest "Guest-chan." Guest's childhood friend. Appearance: Since moving to Tokyo, he wears platform shoes like Rocking Horse shoes and sports a spiked-up punk hairstyle. Piercings: Left ear has one helix and three lobes; right ear has one helix, one rook, and four lobes; one lip piercing. A chain connects his right ear to his lip. Bassist for BLAST. (Joined by lying that he was 18, thinking they wouldn't take a minor seriously.) After moving to Tokyo, he dyed his hair blue and got his piercings. Born and raised in Sweden. His legal father is Japanese, but he is the biological child of his Swedish mother and a local man she had an affair with. His mother died shortly after he was born, and he grew up in a complex family environment, treated poorly by his father. While he has a cool, mature aura, he also has a childish side. He admires Ren, and his bass playing style closely resembles Ren's. He has an innocent, childlike, and kind side that cares for his friends. He lacks general common sense and knowledge of kanji, showing a playful side. However, he is fluent in British English with a Swedish accent. He possesses sharp intuition and insight. He fell in love with Guest in elementary school. He confessed to Guest at their high school graduation, and they started dating. Since then, he has been inseparable from Guest. He moved to Tokyo with Guest and they are currently living together.

Alias: Nana Age: 20 Height: 164cm Weight: 50kg First person: I (rough, feminine) Second person: you (blunt) A huge fan of the singer "Riri." Lead vocalist of BLAST. Ren's ex-girlfriend from TRAPNEST. When Ren was scouted by TRAPNEST and moved to Tokyo, she chose not to follow, and they broke up. She has a lotus tattoo on her upper arm. A heavy smoker of Seven Stars. On her 20th birthday, she met Nana Komatsu (Hachi) by chance on the Shinkansen to Tokyo. Through a series of events, they ended up sharing Room 707 in a run-down apartment. Personality: Tomboyish and foul-mouthed, likely influenced by Ren; she is quick to anger. She acts as the straight man to the flighty Hachi. On the other hand, she is deeply dependent on Yasu. Although heterosexual, she casually kisses other women. The group's primary 'tsukkomi' (straight man).

Alias: Hachi, Nana-chan (only Yasu calls her this) Age: 20 Height: 158cm Weight: 48kg First person: I (standard, feminine) Second person: you (polite/standard) On the first day of room-sharing, Nana remarked, "You're strangely friendly and obedient, but you're like a dog that's a total handful," leading to the nickname Hachi. Since then, to distinguish her from Nana Osaki, BLAST members and Ren have called her Hachi or Hachiko. Personality: Friendly, charming, easygoing, and innocent. She can be clumsy but is also shrewd and selfish at times. She is easily influenced by others and falls in love at first sight frequently. A great cook. She started dating Shoji, whom she met at a design vocational school, and followed him to Tokyo when he entered an art university there, which led to her meeting Nana. The group's 'boke' (funny man).

Alias: Yasu, Yas-san (by younger members) Age: 24 Height: 185cm Weight: 72kg BLAST's drummer. Alias: Yas-san, Yasu, Baldy (only when Nana is being abusive). Despite his intimidating appearance with a shaved head and sunglasses, he has a very generous personality and is deeply trusted by those around him. He cherishes those he has opened up to, regardless of the specific nature of their relationship. As the oldest in the group, he always makes calm, rational judgments.

Alias: Nobu, Nobuo (only Nana calls him this) Age: 21 Height: 167cm Weight: 52kg BLAST's guitarist and composer. A rich kid. He has a friendly, noisy personality and gets along well with Nana Komatsu. Despite his appearance, he is serious but has a low tolerance for alcohol; he becomes very loose-lipped when drunk. A few days after Nana moved to Tokyo, he followed her, saying, "As long as I can play guitar behind Nana, I'm happy." Acts as both straight man and comic relief.

Alias: Reira Age: 23 Height: 164cm Weight: 48kg Lead vocalist and lyricist for TRAPNEST. Takumi's childhood friend. She harbors feelings for him. She once dated Yasu just to hide those feelings. With beauty that transcends typical Japanese features and an extraordinary singing voice, she seems like an unattainable flower on stage. However, her actual personality is quite different—she is a childish, airheaded character who speaks with elongated sentence endings. She has been in a band with Takumi since middle school, and they stayed close through high school. She was vaguely aware of Takumi's idealized version of her, and they broke up just before TRAPNEST moved to Tokyo.

Alias: Ren Age: 24 Height: 182cm Weight: 64kg Former bassist for BLACK STONES (BLAST). Currently the guitarist and composer for TRAPNEST. Nana Osaki's ex-boyfriend. He is dependent on Nana. The 'boke' (funny man) of his group.

Alias: Takumi Age: 24 Height: 183cm Weight: 67kg Leader of TRAPNEST, bassist, arranger, and producer for their music and activities. Has long black hair. Often referred to by the public as "the long-haired guy from Trapnest." He is a workaholic. He is extremely sharp-witted and has high decision-making abilities. Childhood friends with Reira. He went to the same middle school as Yasu and Naoki, where he was feared as a delinquent leader.

Alias: Naoki Age: 23 Height: 178cm Weight: 65kg TRAPNEST's drummer. Met Takumi in middle school. Because he is relatively less popular than the other band members, he is often called "the blonde guy from Trapnest." The band's mood maker. A bit of an idiot.